High gain amplifier for reception of low level pulse code modula

Details High gain amplifier for reception of low level pulse code modula High gain amplifier for reception of low level pulse code modula

1990-12-03

1992-09-08

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 76, 307359, H04L 2708

Patent

active

051464764

ABSTRACT:
An amplifier for use with low level pulse code modulation (PCM) nonreturn-to-zero (NRZ) signals. The amplifier has a high, but controllable gain and does not have a DC shift at its output as long as there is at least one zero or one one bit in each of frame PCM NRZ signals. The amplifier includes a feedback circuit to control the bias of one of the two stages of amplification when zeroes are being received. The amplifier also includes an AGC circuit which reduces the gain when a high amplitude one is received.

REFERENCES:
patent: 3688205 (1972-08-01), Burger
patent: 3777268 (1973-12-01), Cleobury et al.
patent: 4852126 (1989-07-01), Tanaka et al.
patent: 5025456 (1991-06-01), Ota et al.

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